I wanted to test the bias stability of an OFET. From the literature it is found that the gate and drain voltages need to be kept constant and measure drain current variation as a function of time. I could not get it done using SCS 4200. Separate sourse measure units were also tried using labview but it did not work.
Dear Rashma,
welcome!
There are some questions which may lead you to trouble shoot your measuring setup.
Did you verify that VGS and VDS are kept constant during the measurement?
What is the order of the drain current and the gate current you expect. Knowing the order you can use the appropriate measuring range of the ammeters.
What are the expected variations with time, for example x percentage in one hour? How do you sample and access the currents with time.
You have to answer these questions explicitly to solve your problem.
I think it is a sensitivity selection problem of the ammeters.
Best wishes
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